diff --git a/src/main/java/com/yeonieum/productservice/domain/customer/service/CustomerService.java b/src/main/java/com/yeonieum/productservice/domain/customer/service/CustomerService.java
index d0557d3..6d1a4b1 100644
--- a/src/main/java/com/yeonieum/productservice/domain/customer/service/CustomerService.java
+++ b/src/main/java/com/yeonieum/productservice/domain/customer/service/CustomerService.java
@@ -67,7 +67,7 @@ public int retrieveDeliveryFee(Long customerId) {
      */
     @Transactional
     public CustomerResponse.OfRetrieveForAuth retrieveCustomerForAuth(String businessNumber) {
-        Customer targetCustomer = customerRepository.findById(Long.valueOf(businessNumber))
+        Customer targetCustomer = customerRepository.findByStoreBusinessNumber(businessNumber)
                 .orElseThrow(() -> new CustomerException(CUSTOMER_NOT_FOUND, HttpStatus.NOT_FOUND));
 
         return CustomerResponse.OfRetrieveForAuth.convertedBy(targetCustomer);